question
Which statement best describes the role of gene expression in cells?
answer
To become specialized, cells need to control the production of proteins coded for in their DNA.
question
Scientists can insert a gene into a bacterium.How does this biotechnology help individuals with diabetes?
answer
When the bacterium reproduces, it passes the gene for human insulin to its offspring. The offspring form a colony of bacteria that contain the gene for human insulin, which can then be used to produce insulin for a person with diabetes.
question
Cells in the hair follicles produce the protein keratin. Cells in the liver do not produce keratin.Why?
answer
Genes are expressed differently in liver cells and hair follicles
question
When a human embryo is developing, the embryo produces a special type of hemoglobin not found in infant, child, or adult blood.Which statement best explains how an embryo can produce a different type of hemoglobin from that of an infant, child, or adult?
answer
Humans have genes for different types of hemoglobin, and they are expressed at different times.
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question
At which steps do cells control gene expression?
answer
transcription, translation, and the formation of the final protein
question
After which event could it be said that evolution has occurred?
answer
An allele frequency in a population changes over time.
question
Which situation would most likely result in evolution?
answer
A butterfly predator sees yellow more easily than it does green, and a population of butterflies includes both phenotypes.
question
On the graphs, the dashed line represents the original population, and the solid line represents the population after natural selection has taken place.A population of snails is experiencing disruptive selection in terms of their shell patterns.Which graph represents the population?
answer
c (the graph with the squiggly M)
question
A bat wing, an alligator leg, and a human arm are homologous structures.Which fact about those structures best supports one aspect of theory of evolution?
answer
The fact that the bone structures are similar supports the concept that the animals shared a common ancestor.
question
The Hardy-Weinberg equation shows the frequencies of 100 percent of the alleles for a specific gene in a population.If biologists can show that either p or q is changing over a period of time, what is occurring in the population?
answer
The population is evolving
question
An organism new to science was discovered during a recent underwater expedition to the Great Barrier Reef in Australia. The organism is multicellular, has chloroplasts, and is made up of eukaryotic cells.In which domain would a scientist place this organism?
question
Take a look at the phylogenetic tree.Which two organisms on the tree would be expected to share the most characteristics?
answer
cnidarians and animals with bilateral symmetry
question
Which characteristic do plants, people, and flatworms share?
answer
They all exchange gases with the environment
question
All organisms need energy to live. ATP is the fuel that powers all the activities of cells.Which statement best describes how ferns, people, and flatworms obtain energy?
answer
Ferns produce glucose that can be broken down by cellular respiration, while flatworms and people digest foods containing glucose for use in cellular respiration
question
Which description of how flatworms and people remove waste from their bodies is most accurate?
answer
Flatworms release carbon dioxide directly from the skin, and use a simple digestive system to remove liquid waste. People use lungs to remove carbon dioxide, and have developed complex excretory and digestive systems to remove waste
question
Which statement best describes the relationship between plants and oxygen?
answer
Plants produce oxygen during photosynthesis, and they also need oxygen gas from the air for cellular respiration
question
What does a human neuron use to send a signal to the brain in response to a stimulus such as touch?
answer
electrical signals and chemical neurotransmitters
question
What happens inside muscles when they contract?
answer
Myosin heads attach to and move along actin-binding sites.
question
What is the difference between the life cycle of ferns and the life cycle of humans?
answer
Plants have a two-part life cycle, spending part of their life in a diploid phase and part in a multicellular haploid phase. Humans spend their lives in a diploid phase and produce gametes that are haploid
question
The human immune system uses a variety of means to defend the body from pathogens.Which list of elements are parts of the human immune system?
answer
skin, lymph nodes, white blood cells, and spleen
question
Which abiotic factor is most likely in a desert?
question
When sea otters were overhunted along the Pacific Coast, what happened?
answer
The sea urchin population expanded and consumed the kelp and damaged the habitat
question
What are the levels of the biosphere from smallest to largest, left to right?
answer
individual—population—community—ecosystem—biome
question
The following flow of energy occurs in the trophic levels in an ecosystem:sedge → arctic hare→ arctic fox→ wolfWhich organism is located in the trophic level that contains the least amount of energy?
question
Global warming and climate change are important topics in environmental biology.In what way, if any, should scientists contribute to the discussion on global warming and climate change?
answer
Scientists provide sound scientific data to help society make informed decisions
question
just took the test good luck !!!
